Question

Which among the following is/are not a form of oxygen present in the atmosphere?

• A. Molecular oxygen $\left(O_2\right)$
• B. Ozone $O_3$
• C. Oxygen radical (O)
• D. Tetra atomic oxygen $O_4$

Answer 1

Answer: (C), (D)

The correct options are
C Oxygen radical (O)
D Tetra atomic oxygen $O_4$

The two forms of oxygen found in the atmosphere are:
i) Molecular oxygen $\left(O_2\right)$
ii) Ozone $\left(O_3\right)$
Oxygen is required for the process of respiration, which is essential to survive life on earth. Ozone is a poisonous gas and is thus only present as a thin layer in the stratosphere.